Glass coated cbn particles and method of making them

Abstract

A coated superabrasive material and method of making the coated superabrasive material are provided. The coated superabrasive material may comprise a core and a glass coating. The core may comprise a superabrasive crystal. The glass coating may evenly cover an outside surface of the core. The glass coating may range from about 1 wt % to about 15 wt % of the superabrasive crystal. The glass coating may have thickness from about 1 micron to about 2 microns.

What is claimed is: 
     
         1 . A method of making coated superabrasive material, comprising:
 blending superabrasive particles with a binder phase;   mixing glass frits into the blended mixture at a first predetermined temperature;   sieving out the superabrasive particles which were encapsulated with the glass frits; and   mixing a spacer with the encapsulated superabrasive particles and heating the spacer with the encapsulated superabrasive particles up to a second predetermined temperature.   
     
     
         2 . The method of  claim 1 , wherein the first predetermined temperature ranges from about 55° C. to 90° C. 
     
     
         3 . The method of  claim 1 , wherein the second predetermined temperature ranges from about 600° C. to about 1100° C. 
     
     
         4 . The method of  claim 1 , wherein the spacer is selected from a group consisting of a metal, a metal alloy, or a metal oxide. 
     
     
         5 . The method of  claim 1 , wherein the spacer has a particle size smaller than the superabrasive particles. 
     
     
         6 . The method of  claim 1 , wherein the spacer is aluminum oxide. 
     
     
         7 . The method of  claim 1 , wherein the binder phase is water. 
     
     
         8 . The method of  claim 1 , further comprising vacuuming the mixture of the spacer, glass frits and superabrasive particles during heating up for the second predetermined temperature. 
     
     
         9 . A coated superabrasive material, comprising:
 a core comprising a superabrasive crystal; and   a glass coating evenly covering an outside surface of the core, wherein the glass coating ranges from about 1 wt % to about 15 wt % of the superabrasive crystal and has a thickness ranging from about 1 micron to about 2 microns.   
     
     
         10 . The coated superabrasive material of  claim 9 , wherein the superabrasive crystal has sizes ranging from about 100 microns to about 200 microns. 
     
     
         11 . The coated superabrasive material of  claim 9 , wherein the superabrasive crystal is selected from a group consisting of cubic boron nitride, diamond and diamond composite materials. 
     
     
         12 . The coated superabrasive material of  claim 9 , wherein the superabrasive crystal is a monocrystaline or polycrystalline superabrasives. 
     
     
         13 . The coated superabrasive material of  claim 9 , wherein the superabrasive crystal has uneven surfaces. 
     
     
         14 . The coated superabrasive material of  claim 9 , wherein the superabrasive crystal has peaks or spikes on surfaces. 
     
     
         15 . The coated superabrasive material of  claim 9 , wherein the superabrasive crystal has a toughness index of more than 85. 
     
     
         16 . A method of making coated superabrasive material, comprising:
 blending glass frits with a plurality of wetted superabrasive particles;   heating the blended mixture to a first predetermined temperature; and   mixing a spacer with the encapsulated superabrasive particles and heating the spacer with the encapsulated superabrasive particles up to a second predetermined temperature.   
     
     
         17 . The method of  claim 16 , further comprising sieving out glass coated superabrasive particles from the spacer. 
     
     
         18 . The method of  claim 16 , wherein the first predetermined temperature ranges from about 55° C. to 90° C. 
     
     
         19 . The method of  claim 16 , wherein the second predetermined temperature ranges from about 600° C. to about 1100° C. 
     
     
         20 . The method of  claim 16 , wherein the spacer is selected from a group consisting of a metal, a metal alloy, or a metal oxide. 
     
     
         21 . The method of  claim 16 , wherein the spacer has a size smaller than the superabrasive particles. 
     
     
         22 . The method of  claim 16 , wherein the spacer is aluminum oxide. 
     
     
         23 . The method of  claim 16 , wherein the binder phase is water. 
     
     
         24 . The method of  claim 16 , further comprising vacuuming the mixture of the spacer, glass frits and superabrasive particles during heating up for the second predetermined temperature. 
     
     
         25 . The method of  claim 16 , further comprising sieving out the superabrasive particles which were encapsulated with glass frits.